Respiratory trainer



FIG. 1 is a perspective view of the respiratory trainer;

FIG. 2 is a top view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a right view thereof; and,

FIG. 7 is a bottom view thereof.

Portions of the article shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a respiratory trainer, substantially as shown and described. 